28646279964 has 144 divisors (see below), whose sum is σ = 79081480800. Its totient is φ = 8965711872.

The previous prime is 28646279941. The next prime is 28646279989. The reversal of 28646279964 is 46997264682.

28646279964 is a `hidden beast` number, since 2 + 86 + 462 + 7 + 9 + 96 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17758822 + ... + 17760434.

It is an arithmetic number, because the mean of its divisors is an integer number (549176950).

Almost surely, 2^28646279964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28646279964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39540740400).

28646279964 is an abundant number, since it is smaller than the sum of its proper divisors (50435200836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28646279964 is a wasteful number, since it uses less digits than its factorization.

28646279964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2229 (or 2204 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The spelling of 28646279964 in words is "twenty-eight billion, six hundred forty-six million, two hundred seventy-nine thousand, nine hundred sixty-four".